Models of the structure of Rh proteins.³²  (A) Hypothetical heterotrimer comprising RhAG (pink), RhD polypeptide (gray), and RhCE polypeptide (cyan). Residues in the D polypeptide differing from those in the CE polypeptide are shown as blue spheres. Cc and Ee associated residues on the CE polypeptide are shown as red and green spheres, respectively. (B) Hypothetical heterotrimer comprising RhAG (pink), Rh D polypeptide (gray), and Rh CE polypeptide (cyan) same as in panel A but showing the molecular surface.